WO2000009869A1 - Device for catalytic exhaust gas purification - Google Patents

Device for catalytic exhaust gas purification Download PDF

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Publication number
WO2000009869A1
WO2000009869A1 PCT/DE1999/002350 DE9902350W WO0009869A1 WO 2000009869 A1 WO2000009869 A1 WO 2000009869A1 DE 9902350 W DE9902350 W DE 9902350W WO 0009869 A1 WO0009869 A1 WO 0009869A1
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WO
WIPO (PCT)
Prior art keywords
exhaust gas
injection
space
mixing
sound
Prior art date
Application number
PCT/DE1999/002350
Other languages
German (de)
French (fr)
Inventor
Klaus Rusch
Original Assignee
Siemens Aktiengesellschaft
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Siemens Aktiengesellschaft filed Critical Siemens Aktiengesellschaft
Priority to AT99950473T priority Critical patent/ATE214783T1/en
Priority to EP99950473A priority patent/EP1108122B1/en
Priority to JP2000565284A priority patent/JP2002522703A/en
Priority to KR1020017001750A priority patent/KR20010072389A/en
Priority to DK99950473T priority patent/DK1108122T3/en
Priority to DE59901031T priority patent/DE59901031D1/en
Publication of WO2000009869A1 publication Critical patent/WO2000009869A1/en
Priority to US09/781,207 priority patent/US6442933B2/en

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
    • F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
    • F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
    • F01N3/2066—Selective catalytic reduction [SCR]
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N1/00—Silencing apparatus characterised by method of silencing
    • F01N1/24—Silencing apparatus characterised by method of silencing by using sound-absorbing materials
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/24—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by constructional aspects of converting apparatus
    • F01N3/28—Construction of catalytic reactors
    • F01N3/2882—Catalytic reactors combined or associated with other devices, e.g. exhaust silencers or other exhaust purification devices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2230/00—Combination of silencers and other devices
    • F01N2230/04—Catalytic converters
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2240/00—Combination or association of two or more different exhaust treating devices, or of at least one such device with an auxiliary device, not covered by indexing codes F01N2230/00 or F01N2250/00, one of the devices being
    • F01N2240/20—Combination or association of two or more different exhaust treating devices, or of at least one such device with an auxiliary device, not covered by indexing codes F01N2230/00 or F01N2250/00, one of the devices being a flow director or deflector
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2470/00—Structure or shape of gas passages, pipes or tubes
    • F01N2470/02—Tubes being perforated
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2610/00—Adding substances to exhaust gases
    • F01N2610/02—Adding substances to exhaust gases the substance being ammonia or urea
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/12—Improving ICE efficiencies

Definitions

  • the invention relates to a device for the catalytic removal of a pollutant from the exhaust gas of an incineration plant, such as a fossil fuel power plant or an internal combustion engine, with an exhaust gas duct for guiding the exhaust gas, with a nozzle device which is used to introduce a Reagent is provided in the exhaust gas in an injection space of the exhaust duct, and with a catalyst installed in the exhaust duct.
  • an incineration plant such as a fossil fuel power plant or an internal combustion engine
  • Pollutants such as nitrogen oxides (NOx), hydrocarbons, carbon monoxide and sulfur oxides. At appropriate combustion temperatures, dioxins and furans are also produced. These pollutants can be released into the environment via the exhaust gas from the incineration plant.
  • an incinerator can e.g. a boiler plant, a fossil power plant, but also an internal combustion engine.
  • DeNOx catalysts which convert the nitrogen oxides (NOx) contained in the exhaust gas with a reducing agent, usually ammonia or urea, to environmentally neutral nitrogen and water using the selective catalytic reduction (SCR) process .
  • SCR selective catalytic reduction
  • the reducing agent is introduced into the exhaust gas upstream of the catalytic converter in the flow direction of the exhaust gas. It then occurs in as homogeneous a mixture as possible with the nitrogen oxides contained in the exhaust gas Catalyst.
  • Several catalysts can also be connected in series.
  • catalysts containing noble metals are known, on which hydrocarbons and carbon monoxide are converted with nitrogen oxides to carbon dioxide, nitrogen and / or water.
  • the aforementioned DeNOx catalyst can be used to remove nitrogen oxide from the exhaust gas of a diesel engine.
  • urea This urea is injected into the exhaust gas flow as required.
  • a regulated diesel catalytic converter With such a regulated diesel catalytic converter, it is possible to significantly reduce the nitrogen oxide content in the exhaust gas of the diesel engine.
  • An SCR device for the catalytic removal of NOx in the exhaust gas of an incineration plant is initially required to significantly and effectively reduce the NOx emission.
  • a reduction in noise emissions is usually required. This sound is generated by the operation of the incinerator and is a problem for the environment. There is a requirement to keep the space requirements as low as possible. So far, the installation of a separate muffler in the exhaust duct has been provided to reduce noise emissions. As a result, the noise emission could be reduced below the permissible limit values.
  • additional costs, an increased pressure loss and a larger space requirement are disadvantageously noticeable with this solution.
  • the object of the invention is to design a device of the type mentioned at the outset in such a way that no unnecessary space is required for a separate silencer.
  • the invention is based on the consideration that this object can be achieved if different functions can be combined in an already existing component.
  • the injection space and an optionally downstream mixing space, which is provided for mixing the reactant introduced with the exhaust gas, are / are designed as silencers.
  • an SCR catalytic converter system for the exhaust gas of an incineration system can be constructed very compactly and inexpensively due to the design of the injection and / or mixing space as a silencer.
  • the injection space and / or the mixing space can be lined with a perforated plate or a flexible, thin, single or double-layer plate.
  • the injection space and / or the mixing space are / are preferably provided with a sound-absorbing lining.
  • the injection space and the mixing space form a structural unit.
  • FIG. 1 shows an SCR system in a basic representation, a combined injection and mixing space being arranged in a straight direction in front of two SCR catalysts
  • 2 shows a vertical SCR system with a vertical injection and mixing chamber and 180 ° deflection for the exhaust gas
  • 3 shows a SCR system with a straight flow and pipe resonators on the emdus and mixing space
  • FIG. 1 the basic structure of a device for the catalytic removal of the pollutant NOx from the exhaust gas A of a (not shown) combustion system is shown.
  • the exhaust gas A initially flows into a tubular structural unit 2 which comprises an emdus chamber 4 and a downstream mixing chamber 6.
  • the assembly 2 is part of an exhaust gas duct, generally designated 8, which is provided for guiding the exhaust gas A.
  • a nozzle nozzle 10 with a nozzle 12 leads into the nozzle chamber 4.
  • This nozzle device 10 is provided for introducing a reducing agent or reactive agent R into the exhaust gas A, which is located in the nozzle chamber 4.
  • the downstream or downstream mixing chamber 6 serves to mix the reactant R introduced with the exhaust gas A.
  • Ammonia or urea for example, can be used as the reagent R.
  • the reducing or reacting agent R can be emitted in pure form (liquid or gaseous) or in solution (e.g. with water or water vapor).
  • a tubular SCR reactor 14 connects to the structural unit 2. This contains two SCR catalytic converters 16 and 18 arranged one behind the other.
  • the exhaust gas A ' which has been cleaned of the pollutant NOx by the catalytic converters 16, 18, leaves the exhaust duct 8 vertically upward.
  • the combined unit 2 fulfills a muffler function.
  • the nozzle space 4 and the mixing space 6 are provided with a sound-absorbing lining 20.
  • Both rooms 4, ⁇ are also equipped with a thin perforated plate 22.
  • the perforated plate 22 serves to hold the lining 20.
  • NOx-containing exhaust gas A is first deflected by 90 ° in the exhaust duct 8 and passed from below into a structural unit 2, which in turn is provided with a sound-absorbing lining 20 and a perforated plate 22.
  • the tubular structural unit 2 comprising the injection space 4 and the mixing space 6 is therefore also vertical here.
  • the exhaust gas A undergoes a 180 ° deflection in a deflection space 23 and enters the downstream space 14 or SCR reactor into two SCR catalysts 16, 18 arranged one behind the other.
  • the cleaned exhaust gas A 'leaves the device after a 90 "deflection.
  • Mixers 24 and 26 are arranged at the entrance and at the exit of the unit 2.
  • baffles 28 are provided in the upper deflection space.
  • a sound-absorbing effect is achieved by various measures:
  • the aforementioned lining of the injection and mixing space 4, 6 with the perforated plate 22 is again provided here.
  • a flexible, thin plate can also be used.
  • This perforated plate 22 is lined with an absorbent material, such as steel wool, ceramic wool, steel fleece or fiber fleece, as the lining 20.
  • reflection attenuation is provided between the mixers 24, 26. This means that the distance between the mixers 24, 26 is matched to the sound frequency to be damped.
  • reflection attenuation is provided at the 180 ° deflection of the exhaust gas A between the unit 2 and the SCR reactor 14.
  • This reflection loss is in the form of a sound-absorbing lining 30 is drawn on the upper inner wall.
  • the deflection does not necessarily have to be exactly 180 °. Any deflection that allows the sound to be reflected in upstream system parts can be used. With a suitable lining of the deflection, sound reflection upstream is possible even with deflections of less than 90 °.
  • FIG. 3 largely corresponds to that of FIG. 1.
  • a pipe resonator is a special form of interference damper: with it, a pipe section protrudes from one side into a chamber, or pipe sections protrude from both sides into a chamber (N. Kiesewetter, "Noise protection in industrial plant construction", 1st ed., Düsseldorf, ISBN 3-464-48503-x, pages 54 to 57, 1992).
  • N. Kiesewetter "Noise protection in industrial plant construction", 1st ed., Düsseldorf, ISBN 3-464-48503-x, pages 54 to 57, 1992.
  • the inflow and outflow of the SCR reactor 14 can also be designed.
  • the structural design of the embodiment according to FIG. 4 largely corresponds to that of FIG. 2.
  • a largely rotationally symmetrical structure has been chosen here, so that a type of barrel-shaped construction ("barrel") results.
  • the upper deflection space 23 with the 180 ° deflection is in turn lined with a sound-absorbing material 30.
  • the structural unit 2 is also in turn designed as a silencer, in the manner explained above.
  • a barrel-shaped structure is selected here.
  • a characteristic feature is, generally speaking, that the injection and mixing space is surrounded by the catalyst, that there is a deflection at the end of the injection and mixing space, and that the flow direction in the injection and mixing space is opposite to the flow direction in the catalyst.
  • FIG. 5 shows some options for executing the combined structural unit 2, which includes the injection space 4 and the mixing space 6. All of the features shown need not necessarily be present at the same time.
  • the inflow and outflow sides are again designed as pipe resonators 32 and 34, respectively. They are matched to the sound frequency to be damped.
  • the structural unit 2 is provided with a sound-absorbing lining 20 over the entire length of the tube. Their material and thickness are also matched to the sound frequency to be damped.
  • the hole size and the length of the distance with the perforated plate 22 are matched to the sound frequency to be damped.
  • Inside the assembly 2 there is an inner tube 38 which is thin-walled. It could also be formed in two layers with an air gap between the two layers. Again, the distance between the two mixers 24 and 26 is matched to the sound frequency.
  • a backing of the perforated plate 22 is designated. This is an abrasion-resistant material that is temperature-resistant and does not allow discharge through the perforated plate 22.
  • a cladding tube 40 is provided in the area of the nozzle 12. This is thin-walled. It can also be formed in two layers with an air gap between the layers. This cladding tube 40 is held in the interior by a holder 42. The cladding tube is aligned in the flow direction of the exhaust gas A.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Toxicology (AREA)
  • Health & Medical Sciences (AREA)
  • Exhaust Gas After Treatment (AREA)
  • Exhaust Silencers (AREA)
  • Exhaust Gas Treatment By Means Of Catalyst (AREA)
  • Filtering Of Dispersed Particles In Gases (AREA)
  • Separation Of Particles Using Liquids (AREA)

Abstract

The device comprises an exhaust gas duct (8) for guiding the exhaust gas (A), an injection device (10) for injecting a reactant (R) into the exhaust gas (A) and at least one built-in catalyst (16, 18) mounted in the exhaust gas duct (8). According to the invention, in order to reduce the emissions of sound while enabling the production of a device having a compact structure, the injection chamber (4) and the downstream mixture chamber (6) for mixing the injected reactant (R) with the exhaust gas (A) are embodied in the form of a silencer.

Description

Beschreibungdescription
Einrichtung zur katalytischen AbgasreinigungDevice for catalytic exhaust gas purification
Die Erfindung bezieht sich auf eine Einrichtung für die kata- lytische Beseitigung eines Schadstoffs aus dem Abgas einer Verbrennungsanlage, wie eines mit fossilem Brennstoff betriebenen Kraftwerks oder eines Verbrennungsmotors, mit einem Abgaskanal zur Leitung des Abgases, mit einer Eindüseinrich- tung, die zur Einbringung eines Reaktionsmittels in das Abgas in einem Eindüsraum des Abgaskanals vorgesehen ist, und mit einem in dem Abgaskanal eingebauten Katalysator.The invention relates to a device for the catalytic removal of a pollutant from the exhaust gas of an incineration plant, such as a fossil fuel power plant or an internal combustion engine, with an exhaust gas duct for guiding the exhaust gas, with a nozzle device which is used to introduce a Reagent is provided in the exhaust gas in an injection space of the exhaust duct, and with a catalyst installed in the exhaust duct.
Bei der Verbrennung eines fossilen Brennstoffs in einer Ver- brennungsanlage entstehen in nicht unerheblichem UmfangWhen a fossil fuel is burned in an incineration plant, it is not inconsiderable
Schadstoffe, wie Stickoxide (NOx) , Kohlenwasserstoffe, Koh- lenmonoxid und Schwefeloxide. Bei entsprechenden Verbrennungstemperaturen entstehen auch Dioxine und Furane. Diese Schadstoffe können über das Abgas der Verbrennungsanlage in die Umwelt gelangen. Eine derartige Verbrennungsanlage kann z.B. eine Kesselanlage, ein Fossilkraftwerk, aber auch ein Verbrennungsmotor sein.Pollutants such as nitrogen oxides (NOx), hydrocarbons, carbon monoxide and sulfur oxides. At appropriate combustion temperatures, dioxins and furans are also produced. These pollutants can be released into the environment via the exhaust gas from the incineration plant. Such an incinerator can e.g. a boiler plant, a fossil power plant, but also an internal combustion engine.
Aufgrund strenger gesetzlicher Vorschriften, welche die Ab- gäbe der obengenannten Schadstoffe limitieren, ist für Verbrennungsanlagen eine Behandlung des Abgases zur Verminderung der darin enthaltenen Schadstoffe erforderlich. Hierzu sind in der Vergangenheit eine Vielzahl von Katalysatoren entwik- kelt worden. So sind zur Verringerung von Stickoxiden die so- genannten DeNOx-Katalysatoren bekannt, welche die im Abgas enthaltenen Stickoxide (NOx) mit einem Reduktionsmittel, meist Ammoniak oder Harnstoff, nach dem Verfahren der Selektiven Katalytischen Reduktion (SCR) zu umweltneutralem Stickstoff und zu Wasser umsetzen. Das Reduktionsmittel wird in Strömungsrichtung des Abgases vor dem Katalysator in das Abgas eingebracht. Es tritt dann in nach Möglichkeit homogener Vermischung mit den im Abgas enthaltenen Stickoxiden in den Katalysator ein. Dabei können auch mehrere Katalysatoren hintereinander geschaltet sein.Due to strict legal regulations, which limit the emission of the above-mentioned pollutants, the exhaust gas has to be treated in order to reduce the pollutants it contains. A large number of catalysts have been developed for this in the past. To reduce nitrogen oxides, the so-called DeNOx catalysts are known, which convert the nitrogen oxides (NOx) contained in the exhaust gas with a reducing agent, usually ammonia or urea, to environmentally neutral nitrogen and water using the selective catalytic reduction (SCR) process . The reducing agent is introduced into the exhaust gas upstream of the catalytic converter in the flow direction of the exhaust gas. It then occurs in as homogeneous a mixture as possible with the nitrogen oxides contained in the exhaust gas Catalyst. Several catalysts can also be connected in series.
Für die Verringerung der Schadstoffe im Abgas eines Otto-Mo- tors sind beispielsweise edelmetallhaltige Katalysatoren bekannt, an denen Kohlenwasserstoffe und Kohlenmonoxid mit Stickoxiden zu Kohlendioxid, Stickstoff und/oder Wasser umgewandelt werden.For reducing the pollutants in the exhaust gas of an Otto engine, for example, catalysts containing noble metals are known, on which hydrocarbons and carbon monoxide are converted with nitrogen oxides to carbon dioxide, nitrogen and / or water.
Zur Stickoxidentfernung aus dem Abgas eines Dieselmotors kann der bereits erwähnte DeNOx-Katalysator verwendet werden. Hier arbeitet man vorzugsweise mit Harnstoff. Dieser Harnstoff wird anforderungsgerecht in den Abgasstrom eingedüst. Mit einem solchen geregelten Diesel-Katalysator ist es möglich, den Stickoxidgehalt im Abgas des Dieselmotors erheblich zu senken.The aforementioned DeNOx catalyst can be used to remove nitrogen oxide from the exhaust gas of a diesel engine. Here one works preferably with urea. This urea is injected into the exhaust gas flow as required. With such a regulated diesel catalytic converter, it is possible to significantly reduce the nitrogen oxide content in the exhaust gas of the diesel engine.
Von einer SCR-Einrichtung für die katalytische Beseitigung von NOx im Abgas einer Verbrennungsanlage wird zunächst ein- mal eine deutliche und effektive Reduzierung der NOx-Emission verlangt. Daneben wird in der Regel auch eine Reduzierung der Schallemissionen gefordert. Dieser Schall entsteht durch den Betrieb der Verbrennungsanlage und stellt ein Problem für die Umwelt dar. Dabei besteht die Forderung, den Platzaufwand möglichst gering zu halten. Bisher hat man zur Reduzierung der Schallemission den Einbau eines separaten Schalldämpfers im Abgaskanal vorgesehen. Dadurch konnte die Schallemission unter die zulässigen Grenzwerte abgesenkt werden. Allerdings machen sich bei dieser Lösng zusätzliche Kosten, ein gestie- gener Druckverlust und ein größerer Platzbedarf nachteilig bemerkbar.An SCR device for the catalytic removal of NOx in the exhaust gas of an incineration plant is initially required to significantly and effectively reduce the NOx emission. In addition, a reduction in noise emissions is usually required. This sound is generated by the operation of the incinerator and is a problem for the environment. There is a requirement to keep the space requirements as low as possible. So far, the installation of a separate muffler in the exhaust duct has been provided to reduce noise emissions. As a result, the noise emission could be reduced below the permissible limit values. However, additional costs, an increased pressure loss and a larger space requirement are disadvantageously noticeable with this solution.
Aufgabe der Erfindung ist es, eine Einrichtung der eingangs genannten Art so auszugestalten, daß kein unnötiger Platzbe- darf für einen separaten Schalldämpfer entsteht. Die Erfindung beruht auf der Überlegung, daß sich diese Aufgabe lösen läßt, wenn sich verschiedene Funktionen in einem bereits vorhandenen Bauteil zusammenfassen lassen.The object of the invention is to design a device of the type mentioned at the outset in such a way that no unnecessary space is required for a separate silencer. The invention is based on the consideration that this object can be achieved if different functions can be combined in an already existing component.
Die genannte Aufgabe wird demgemäß erfindungsgemäß dadurch gelöst, daß der Eindüsraum und ein gegebenenfalls nachgeschalteter Mischraum, der zur Vermischung des eingebrachten Reaktionsmittels mit dem Abgas vorgesehen ist, als Schalldämpfer ausgebildet ist/sind.The stated object is accordingly achieved according to the invention in that the injection space and an optionally downstream mixing space, which is provided for mixing the reactant introduced with the exhaust gas, are / are designed as silencers.
Der Vorteil dieser Lösung besteht darin, daß sich aufgrund der Ausgestaltung des Eindüs- und/oder Mischraums als Schalldämpfer eine SCR-Katalysator-Anlage für das Abgas einer Verbrennungsanlage sehr kompakt und kostengünstig aufbauen läßt. Zwecks Schalldämpfung können/kann der Eindüsraum und/oder der Mischraum mit einem Lochblech oder einem flexiblen, dünnen, ein- oder doppelschichtigen Blech ausgekleidet sein. Bevorzugt sind/ist der Eindüsraum und/oder der Mischraum mit einer schalldämmenden Auskleidung versehen.The advantage of this solution is that an SCR catalytic converter system for the exhaust gas of an incineration system can be constructed very compactly and inexpensively due to the design of the injection and / or mixing space as a silencer. For the purpose of soundproofing, the injection space and / or the mixing space can be lined with a perforated plate or a flexible, thin, single or double-layer plate. The injection space and / or the mixing space are / are preferably provided with a sound-absorbing lining.
In der Regel werden der Eindüsraum und der Mischraum eine Baueinheit bilden.As a rule, the injection space and the mixing space form a structural unit.
Weitere vorteilhafte Ausgestaltungen sind in den Unteransprü- chen gekennzeichnet.Further advantageous refinements are characterized in the subclaims.
Ausführungsbeispiele der Erfindung werden im folgenden anhand von fünf Figuren näher erläutert. Dabei werden dieselben Bezugszeichen für gleiche Bauteile verwendet. Es zeigen:Exemplary embodiments of the invention are explained in more detail below with reference to five figures. The same reference numerals are used for the same components. Show it:
FIG 1 eine SCR-Anlage in prinzipieller Darstellung, wobei ein kombinierter Eindüs- und Mischraum in gerader Richtung vor zwei SCR-Katalysatoren angeordnet ist,1 shows an SCR system in a basic representation, a combined injection and mixing space being arranged in a straight direction in front of two SCR catalysts,
FIG 2 eine senkrecht stehende SCR-Anlage mit senkrechtem Eindüs- und Mischraum und 180°-Umlenkung für das Abgas, FIG 3 eine gerade durchströmte SCR-Anlage mit Pfeifenresonatoren am Emdus- und Mischraum,2 shows a vertical SCR system with a vertical injection and mixing chamber and 180 ° deflection for the exhaust gas, 3 shows a SCR system with a straight flow and pipe resonators on the emdus and mixing space,
FIG 4 eine tonnenformige SCR-Anlage mit senkrecht stehendem Emdus- und Mischraum sowie 180°-Umlenkung und4 shows a barrel-shaped SCR system with a vertical standing emdus and mixing chamber and 180 ° deflection and
FIG 5 einen rohrformigen Emdus- und Mischraum mit verschiedenen Ausgestaltungen zur Schalldämmung.5 shows a tubular Emdus and mixing room with different designs for sound insulation.
In Figur 1 ist der prinzipielle Aufbau einer Einrichtung für die katalytische Beseitigung des Schadstoffs NOx aus dem Abgas A einer (nicht dargestellten) Verbrennungsanlage gezeigt. Das Abgas A strömt hierbei zunächst m eine rohrformige Bau- einheit 2 ein, die einen Emdusraum 4 und einen nachgeschalteten Mischraum 6 umfaßt. Die Baueinheit 2 ist Bestandteil eines allgemein mit 8 bezeichneten Abgaskanals, der zur Leitung des Abgases A vorgesehen ist. In den Eindusraum 4 fuhrt eine Eindus-Emπchtung 10 mit einer Düse 12. Diese Emdus- emrichtung 10 ist zur Einbringung eines Reduktions- oder Re- aktionsmittels R in das Abgas A, das sich im Emdusraum 4 befindet, vorgesehen. Der nachgeordnete oder nachgeschaltete Mischraum 6 dient zur Vermischung des eingebrachten Reakti- onsmittels R mit dem Abgas A. Als Reaktionsmittel R kann bei- spielsweise Ammoniak oder Harnstoff verwendet werden. Allgemein gesprochen: Das Reduktions- oder Reaktionsmittel R kann in reiner Form (flussig oder gasformig) oder auch in Losung (z.B. mit Wasser oder Wasserdampf) emgedust werden.In Figure 1, the basic structure of a device for the catalytic removal of the pollutant NOx from the exhaust gas A of a (not shown) combustion system is shown. In this case, the exhaust gas A initially flows into a tubular structural unit 2 which comprises an emdus chamber 4 and a downstream mixing chamber 6. The assembly 2 is part of an exhaust gas duct, generally designated 8, which is provided for guiding the exhaust gas A. A nozzle nozzle 10 with a nozzle 12 leads into the nozzle chamber 4. This nozzle device 10 is provided for introducing a reducing agent or reactive agent R into the exhaust gas A, which is located in the nozzle chamber 4. The downstream or downstream mixing chamber 6 serves to mix the reactant R introduced with the exhaust gas A. Ammonia or urea, for example, can be used as the reagent R. Generally speaking, the reducing or reacting agent R can be emitted in pure form (liquid or gaseous) or in solution (e.g. with water or water vapor).
An die Baueinheit 2 schließt sich ein rohrformiger SCR-Reak- tor 14 an. Dieser enthalt zwei hintereinander angeordnete SCR-Katalysatoren 16 und 18. Das den Katalysatoren 16, 18 vom Schadstoff NOx gereinigte Abgas A' verlaßt den Abgaskanal 8 senkrecht nach oben.A tubular SCR reactor 14 connects to the structural unit 2. This contains two SCR catalytic converters 16 and 18 arranged one behind the other. The exhaust gas A ', which has been cleaned of the pollutant NOx by the catalytic converters 16, 18, leaves the exhaust duct 8 vertically upward.
Von Bedeutung ist nun, daß d e kombinierte Baueinheit 2 eine Schalldampferfunktion erfüllt. Zu diesem Zweck sind der E n- düsraum 4 und der Mischraum 6 mit einer schalldämmenden Auskleidung 20 versehen. Beide Räume 4, β sind darüber hinaus mit einem dünnen Lochblech 22 ausgerüstet. Das Lochblech 22 dient der Halterung der Auskleidung 20.It is important that the combined unit 2 fulfills a muffler function. For this purpose, the nozzle space 4 and the mixing space 6 are provided with a sound-absorbing lining 20. Both rooms 4, β are also equipped with a thin perforated plate 22. The perforated plate 22 serves to hold the lining 20.
Nach Figur 2 wird NOx-haltiges Abgas A im Abgaskanal 8 zunächst um 90° abgelenkt und von unten in eine Baueinheit 2 geleitet, die wiederum mit einer schalldämmenden Auskleidung 20 und einem Lochblech 22 versehen ist. Die den Eindüsraum 4 und den Mischraum 6 umfassende rohrförmige Baueinheit 2 steht also auch hier senkrecht. Am Ausgang dieser Baueinheit 2 erfährt das Abgas A eine 180° -Umlenkung in einem Umlenkraum 23 und tritt in dem nachgeschalteten Raum 14 oder SCR-Reaktor in zwei hintereinander angeordnete SCR-Katalysatoren 16, 18 ein. Das gereinigte Abgas A' verläßt die Einrichtung nach einer 90 "-Umlenkung. Am Eingang und am Ausgang der Baueinheit 2 sind Mischer 24 bzw. 26 angeordnet. Zwecks Erleichterung der 180 "-Umlenkung sind im oberen Umlenkraum 23 Leitbleche 28 vorgesehen.According to FIG. 2, NOx-containing exhaust gas A is first deflected by 90 ° in the exhaust duct 8 and passed from below into a structural unit 2, which in turn is provided with a sound-absorbing lining 20 and a perforated plate 22. The tubular structural unit 2 comprising the injection space 4 and the mixing space 6 is therefore also vertical here. At the outlet of this assembly 2, the exhaust gas A undergoes a 180 ° deflection in a deflection space 23 and enters the downstream space 14 or SCR reactor into two SCR catalysts 16, 18 arranged one behind the other. The cleaned exhaust gas A 'leaves the device after a 90 "deflection. Mixers 24 and 26 are arranged at the entrance and at the exit of the unit 2. In order to facilitate the 180" deflection, 23 baffles 28 are provided in the upper deflection space.
Im Ausführungsbeispiel von Figur 2 wird eine schalldämmende Wirkung erreicht durch verschiedene Maßnahmen:In the exemplary embodiment in FIG. 2, a sound-absorbing effect is achieved by various measures:
Zum ersten ist hier wiederum die erwähnte Auskleidung des Eindüs- und Mischraums 4, 6 mit dem Lochblech 22 vorgesehen. Anstelle dieses Lochbleches 22 kann auch ein flexibles, dünnes Blech verwendet werden. Dieses Lochblech 22 ist mit einem absorbierenden Material, wie Stahlwolle, Keramikwolle, Stahlvlies oder Faservlies, als Auskleidung 20 hinterfüttert.Firstly, the aforementioned lining of the injection and mixing space 4, 6 with the perforated plate 22 is again provided here. Instead of this perforated plate 22, a flexible, thin plate can also be used. This perforated plate 22 is lined with an absorbent material, such as steel wool, ceramic wool, steel fleece or fiber fleece, as the lining 20.
Zum zweiten ist eine Reflexionsdämpfung zwischen den Mischern 24, 26 vorgesehen. Dies bedeutet, daß der Abstand der Mischer 24, 26 auf die zu dämpfende Schallfrequenz abgestimmt ist.Secondly, reflection attenuation is provided between the mixers 24, 26. This means that the distance between the mixers 24, 26 is matched to the sound frequency to be damped.
Zum dritten ist eine Reflexionsdämpfung an der 180 °-Umlenkung des Abgases A zwischen der Baueinheit 2 und dem SCR-Reaktor 14 vorgesehen. Diese Reflexionsdämpfung ist in Form einer schalldämmenden Auskleidung 30 an der oberen Innenwand eingezeichnet.Thirdly, reflection attenuation is provided at the 180 ° deflection of the exhaust gas A between the unit 2 and the SCR reactor 14. This reflection loss is in the form of a sound-absorbing lining 30 is drawn on the upper inner wall.
Bei dieser Ausführungsform sind weitere U lenkungen im Be- reich des Eindüs- und Mischraums 4 bzw. 6 möglich. Dann sollten die Abstände zwischen diesen Umlenkungen so gewählt werden, daß sich eine dämpfende Wirkung durch Resonanz ergibt.In this embodiment, further deflections in the area of the injection and mixing space 4 or 6 are possible. Then the distances between these deflections should be chosen so that a damping effect results from resonance.
Zu Figur 2 ist noch folgendes anzumerken: Die Umlenkung muß nicht notwendigerweise genau 180° betragen. Jede Umlenkung, die eine Reflexion des Schalls in stromauf gelegene Anlagenteile ermöglicht, ist verwendbar. Mit einer entsprechenden Auskleidung der Umlenkung ist sogar bei Umlenkungen kleiner als 90° eine Schallreflexion stromauf möglich.The following should also be noted with regard to FIG. 2: the deflection does not necessarily have to be exactly 180 °. Any deflection that allows the sound to be reflected in upstream system parts can be used. With a suitable lining of the deflection, sound reflection upstream is possible even with deflections of less than 90 °.
Das in Figur 3 dargestellte Ausführungsbeispiel entspricht weitgehend demjenigen von Figur 1. Von besonderer Bedeutung ist hier die Ausgestaltung der Einströmung 32 und der Ausströmung 34 des Abgases A in die bzw. aus der Baueinheit 2 als Pfeifenresonator. Ein Pfeifenresonator ist eine Sonderform des Interferenzdämpfers: bei ihm ragt ein Rohrstück von einer Seite in eine Kammer hinein, oder aber es ragen Rohrstücke von beiden Seiten in eine Kammer hinein (N. Kiesewetter, "Lärmschutz im industriellen Anlagenbau", 1. Aufl., Düs- seldorf, ISBN 3-464-48503-x, Seiten 54 bis 57, 1992) . Es soll noch angemerkt werden, daß die Ein- und Ausströmung des SCR- Reaktors 14 ebenso ausgestaltet sein können.The embodiment shown in FIG. 3 largely corresponds to that of FIG. 1. Of particular importance here is the configuration of the inflow 32 and the outflow 34 of the exhaust gas A into and out of the structural unit 2 as a pipe resonator. A pipe resonator is a special form of interference damper: with it, a pipe section protrudes from one side into a chamber, or pipe sections protrude from both sides into a chamber (N. Kiesewetter, "Noise protection in industrial plant construction", 1st ed., Düsseldorf, ISBN 3-464-48503-x, pages 54 to 57, 1992). It should also be noted that the inflow and outflow of the SCR reactor 14 can also be designed.
Der konstruktive Aufbau der Ausführungsform nach Figur 4 ent- spricht weitgehend demjenigen von Figur 2. Allerdings ist hier eine weitgehend rotationssymmetrische Struktur gewählt, so daß sich eine Art tonnenförmiger Aufbau ("barrel") ergibt. Der obere Umlenkraum 23 mit der 180°-Umlenkung ist wiederum mit einem schalldämmenden Material 30 ausgekleidet. Auch die Baueinheit 2 ist hier wiederum als Schalldämpfer ausgebildet, und zwar in der zuvor erläuterten Weise. Wie gesagt, ist vorliegend ein tonnenförmiger Aufbau ("barrel") gewählt. Dies soll allerdings nicht notwendigerweise Rotationssymmetrie bedeuten. Kennzeichnendes Merkmal ist, generell gesprochen, daß der Eindüs- und Mischraum vom Katalysator umgeben ist, daß sich am Ende des Eindüs- und Mischraums eine Umlenkung befindet, und daß die Strömungsrichtung im Eindüs- und Mischraum entgegen der Strömungsrichtung im Katalysator ist.The structural design of the embodiment according to FIG. 4 largely corresponds to that of FIG. 2. However, a largely rotationally symmetrical structure has been chosen here, so that a type of barrel-shaped construction ("barrel") results. The upper deflection space 23 with the 180 ° deflection is in turn lined with a sound-absorbing material 30. The structural unit 2 is also in turn designed as a silencer, in the manner explained above. As said, a barrel-shaped structure is selected here. However, this should not necessarily mean rotational symmetry. A characteristic feature is, generally speaking, that the injection and mixing space is surrounded by the catalyst, that there is a deflection at the end of the injection and mixing space, and that the flow direction in the injection and mixing space is opposite to the flow direction in the catalyst.
Die Ausführungsform nach Figur 5 zeigt einige Möglichkeiten zur Ausführung der kombinierten Baueinheit 2, die den Eindüsraum 4 und den Mischraum 6 beinhaltet. Es müssen nicht notwendigerweise alle dargestellten Merkmale gleichzeitig vorhanden sein.The embodiment according to FIG. 5 shows some options for executing the combined structural unit 2, which includes the injection space 4 and the mixing space 6. All of the features shown need not necessarily be present at the same time.
Bei der Baueinheit 2 sind die Einströmseite und die Ausströmseite wiederum als Pfeifenresonatoren 32 bzw. 34 ausgebildet. Sie sind auf die zu dämpfende Schallfrequenz abgestimmt. Über die gesamte Rohrlänge ist die Baueinheit 2 mit einer schall- dämmenden Auskleidung 20 versehen. Deren Material und Dicke sind ebenfalls auf die zu dämpfende Schallfrequenz abgestimmt. Im Bereich des Mischraums 6 befindet sich wiederum ein Lochblech 22. Hier sind die Lochgröße sowie die Länge der Strecke mit dem Lochblech 22 auf die zu dämpfende Schallfre- quenz abgestimmt. Innerhalb der Baueinheit 2 befindet sich ein inneres Rohr 38, das dünnwandig ausgeführt ist. Es könnte auch zweischichtig mit einem Luftspalt zwischen den beiden Schichten ausgebildet sein. Auch hier ist wiederum der Abstand zwischen den beiden Mischern 24 und 26 auf die Schall- frequenz abgestimmt.In assembly 2, the inflow and outflow sides are again designed as pipe resonators 32 and 34, respectively. They are matched to the sound frequency to be damped. The structural unit 2 is provided with a sound-absorbing lining 20 over the entire length of the tube. Their material and thickness are also matched to the sound frequency to be damped. In the area of the mixing chamber 6 there is again a perforated plate 22. Here the hole size and the length of the distance with the perforated plate 22 are matched to the sound frequency to be damped. Inside the assembly 2 there is an inner tube 38 which is thin-walled. It could also be formed in two layers with an air gap between the two layers. Again, the distance between the two mixers 24 and 26 is matched to the sound frequency.
Mit 37 ist eine Hinterfütterung des Lochblechs 22 bezeichnet. Hierbei handelt es sich um ein abriebfestes Material, das temperaturbeständig ist und keinen Austrag durch das Loch- blech 22 hindurch zuläßt. Bei der Ausführungsform von Figur 5 ist im Bereich der Düse 12 ein Hüllrohr 40 vorgesehen. Dieses ist dünnwandig ausgeführt. Es kann auch zweischichtig mit einem Luftspalt zwischen den Schichten ausgebildet sein. Dieses Hüllrohr 40 ist durch eine Halterung 42 im Innenraum gehalten. Das Hüllrohr ist in Strömungsrichtung des Abgases A ausgerichtet. With 37 a backing of the perforated plate 22 is designated. This is an abrasion-resistant material that is temperature-resistant and does not allow discharge through the perforated plate 22. In the embodiment of FIG. 5, a cladding tube 40 is provided in the area of the nozzle 12. This is thin-walled. It can also be formed in two layers with an air gap between the layers. This cladding tube 40 is held in the interior by a holder 42. The cladding tube is aligned in the flow direction of the exhaust gas A.

Claims

Patentansprüche claims
1. Einrichtung für die katalytische Beseitigung eines Schadstoffs (NOx) aus dem Abgas (A) einer Verbrennungsanlage, wie eines mit fossilem Brennstoff betriebenen Kraftwerks oder eines Verbrennungsmotors, mit einem Abgaskanal (8) zur Leitung des Abgases (A) , mit einer Eindüs-Einrichtung (10) , die zur Einbringung eines Reaktionsmittels (R) in das Abgas (A) in einem Eindüsraum (4) des Abgaskanals (8) vorgesehen ist, und mit einem in den Abgaskanal (8) eingebauten Katalysator (16, 18), d a d u r c h g e k e n n z e i c h n e t , daß der Eindüsraum (4) und ein gegebenenfalls nachgeschalteter Mischraum (6) , der zur Vermischung des eingebrachten Reaktionsmittels (R) mit dem Abgas (A) vorgesehen ist, als Schalldämpfer ausgebildet ist/sind.1. Device for the catalytic removal of a pollutant (NOx) from the exhaust gas (A) of an incineration plant, such as a power plant operated with fossil fuel or an internal combustion engine, with an exhaust gas duct (8) for guiding the exhaust gas (A), with an injection Device (10), which is provided for introducing a reaction agent (R) into the exhaust gas (A) in an injection space (4) of the exhaust gas duct (8), and with a catalyst (16, 18) built into the exhaust gas duct (8), characterized in that the injection space (4) and an optionally downstream mixing space (6), which is provided for mixing the introduced reactant (R) with the exhaust gas (A), is / are designed as a silencer.
2. Einrichtung nach Anspruch 1, d a d u r c h g e k e n n z e i c h n e t , daß der Ein- düsraum (4) und/oder der Mischraum (6) mit einem Lochblech2. Device according to claim 1, d a d u r c h g e k e n n z e i c h n e t that the injector (4) and / or the mixing chamber (6) with a perforated plate
(22) oder einem flexiblen, dünnen, ein- oder doppelschichtigen Blech (38) ausgekleidet sind/ist (Figuren 2 und 5) .(22) or a flexible, thin, single or double-layer sheet (38) are / is lined (Figures 2 and 5).
3. Einrichtung nach Anspruch 2, d a d u r c h g e k e n n z e i c h n e t , daß das Lochblech (22) oder das flexible Blech (38) mit einem schallabsorbierenden Material (37), wie Stahlwolle, Keramikwolle, Stahlvlies oder Faservlies, hinterfüttert ist (Figuren 2 und 5) .3. Device according to claim 2, so that the perforated plate (22) or the flexible plate (38) is back-lined with a sound-absorbing material (37), such as steel wool, ceramic wool, steel fleece or fiber fleece (FIGS. 2 and 5).
4. Einrichtung nach einem der Ansprüche 1 bis 3, d a d u r c h g e k e n n z e i c h n e t , daß in Strömungsrichtung des Abgases (A) vor und hinter dem Eindüsraum4. Device according to one of claims 1 to 3, d a d u r c h g e k e n n z e i c h n e t that in the flow direction of the exhaust gas (A) in front of and behind the injection space
(4) ein Mischer (24, 26) angeordnet ist, und daß der Abstand der beiden Mischer (24, 26) auf die zu dämpfende Frequenz des Schalls im Abgas (A) abgestimmt ist (Figuren 2 und 5) . (4) a mixer (24, 26) is arranged, and that the distance between the two mixers (24, 26) is matched to the frequency of the sound in the exhaust gas (A) to be damped (FIGS. 2 and 5).
5. Einrichtung nach einem der Ansprüche 1 bis 4, wobei eine 180 "-Umlenkung des Abgases (A) zwischen einem Eingangsteil des Abgaskanals (8) und dem Katalysator (16, 18) vorgesehen ist, d a d u r c h g e k e n n z e i c h n e t , daß im Bereich der 180 "-Umlenkung Mittel (30) zur Reflexionsdämpfung und/oder Absorptionsdämpfung vorgesehen sind (Fig. 2) .5. Device according to one of claims 1 to 4, wherein a 180 "deflection of the exhaust gas (A) between an input part of the exhaust duct (8) and the catalyst (16, 18) is provided, characterized in that in the range of 180" - Deflection means (30) for attenuation of reflection and / or absorption are provided (FIG. 2).
6. Einrichtung nach einem der Ansprüche 1 bis 5, d a d u r c h g e k e n n z e i c h n e t , daß der Eindüsraum (4) und der Mischraum (6) eine Baueinheit (2) bilden (Figuren 1 bis 5) .6. Device according to one of claims 1 to 5, so that the injection chamber (4) and the mixing chamber (6) form a structural unit (2) (Figures 1 to 5).
7. Einrichtung nach Anspruch 6, d a d u r c h g e k e n n z e i c h n e t , daß die Einströmseite und/oder die Ausströmseite der Baueinheit (2) als Pfeifenresonator (32, 34) ausgebildet sind/ist (Fig. 3 und 5) .7. Device according to claim 6, d a d u r c h g e k e n n z e i c h n e t that the inflow side and / or the outflow side of the unit (2) are designed as a pipe resonator (32, 34) / is (Fig. 3 and 5).
8. Einrichtung nach Anspruch 6 oder 7, d a d u r c h g e k e n n z e i c h n e t , daß an der Ausströmseite der Baueinheit (2) eine 180 "-Umlenkung des Abgases (A) vorgesehen ist (Figuren 2 und 4).8. Device according to claim 6 or 7, so that a 180 "deflection of the exhaust gas (A) is provided on the outflow side of the structural unit (2) (FIGS. 2 and 4).
9. Einrichtung nach einem der Ansprüche 1 bis 8, d a d u r c h g e k e n n z e i c h n e t , daß der Eindüsraum (4) und/oder der Mischraum (6) mit einer schalldämmenden Auskleidung (20) versehen sind/ist (Figuren 1 und 5) .9. Device according to one of claims 1 to 8, so that the injection space (4) and / or the mixing space (6) are / is provided with a sound-absorbing lining (20) (Figures 1 and 5).
10. Einrichtung nach einem der Ansprüche 1 bis 9, d a d u r c h g e k e n n z e i c h n e t , daß die Eindüseinrichtung (10) im Bereich ihrer Düse (12) ein in Strömungsrichtung des Abgases (A) ausgerichtetes Hüllrohr (40) aufweist (Fig. 5) . 10. Device according to one of claims 1 to 9, so that the injection device (10) in the region of its nozzle (12) has a cladding tube (40) aligned in the flow direction of the exhaust gas (A) (FIG. 5).
PCT/DE1999/002350 1998-08-11 1999-07-30 Device for catalytic exhaust gas purification WO2000009869A1 (en)

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AT99950473T ATE214783T1 (en) 1998-08-11 1999-07-30 DEVICE FOR CATALYTIC EXHAUST GAS CLEANING
EP99950473A EP1108122B1 (en) 1998-08-11 1999-07-30 Device for catalytic exhaust gas purification
JP2000565284A JP2002522703A (en) 1998-08-11 1999-07-30 Catalytic exhaust gas purification device
KR1020017001750A KR20010072389A (en) 1998-08-11 1999-07-30 Device for catalytic exhaust gas purification
DK99950473T DK1108122T3 (en) 1998-08-11 1999-07-30 Catalytic flue gas cleaning device
DE59901031T DE59901031D1 (en) 1998-08-11 1999-07-30 DEVICE FOR CATALYTIC EXHAUST GAS PURIFICATION
US09/781,207 US6442933B2 (en) 1998-08-11 2001-02-12 Device for catalytic exhaust gas purification

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US20010018826A1 (en) 2001-09-06
ES2174642T3 (en) 2002-11-01

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